Christopher Eppig and his colleagues found that the brain requires a great deal of the body's physical energy. What percentage of this energy is required for brain development in newborns?

Professor Pedagogy's research shows that participation in extracurricular activities is correlated with grades in school. Based on this study's findings, what can Professor Pedagogy conclude?

What will be an ideal response?

After a controversial play, referees meet in the middle of the field to discuss what each saw and explain his/her ruling before coming to a final decision. This most closely resembles which of the following?

a. archival analysis b. dependent variables c. interjudge reliability d. external validity